whats the best build for 450$ dont include mouse or os or keyboard

ACTechy

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At $450 it's not going to be a gaming beast, but here's a decent build at that price:

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: AMD FX-6300 3.5GHz 6-Core Processor ($109.99 @ Amazon)
Motherboard: Asus M5A78L-M LX PLUS Micro ATX AM3+ Motherboard ($44.99 @ Microcenter)
Memory: G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-1600 Memory ($59.99 @ Newegg)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($59.98 @ OutletPC)
Video Card: Sapphire Radeon HD 7770 GHz Edition 1GB Video Card ($100.38 @ Newegg)
Case: Antec One ATX Mid Tower Case ($29.99 @ Newegg)
Power Supply: Corsair CX 430W 80+ Bronze Certified Semi-Modular ATX Power Supply ($24.99 @ Newegg)
Optical Drive: LG GH24NSB0 DVD/CD Writer ($14.99 @ Newegg)
Total: $445.30
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-11-20 00:56 EST-0500)